Wonder no more, because right now you are at the heartbeat of one day cricket's biggest stage - and you have just ripped the heart out of the old enemy at Lord's.

While Mitchell Starc claimed the prized scalps of Joe Root, Eoin Morgan and Ben Stokes, it was a 29-year-old Canberran that laid the platform and topped it off.

For the uninitiated, let me introduce you to Australia's newest World Cup hero coming straight out of Tuggeranong Valley.

Australian selectors now face a pulsing migraine with another fast bowler rocketing into contention for a permanent spot in the defending champions' XI.

Behrendorff claimed 5-44 to help Australia storm into the semi-final stage with a dominant 64-run win over England at Lord's on Wednesday morning.

His second appearance of the tournament coincided with the country's most eagerly awaited - and Behrendorff took his chance.

Nathan Coulter-Nile was forced to watch from the pavilion as a Tuggeranong junior claimed his maiden ODI five-wicket haul which may well secure his place for the remainder of the tournament.

"It's one of those things you dream of as a kid, to play cricket for Australia and to come here at Lord's to get five wickets," Behrendorff said.

"Not quite sure if it's sunk in yet to be honest, but it's something I will treasure. You don't play cricket for the accolades but to take five wickets here is something special."

All former Queensland captain Jason Floros can see when he looks at Behrendorff is a "tubby little kid" nicknamed Jack.

Because that's all Behrendorff was when the pair were growing up. He was a stocky little batsman, sleeping over at the Floros residence before waking up to load cricket kits into a car for a trek up the highway.

The name, well that was just a way for their Tuggeranong coach to differentiate the two Jasons. It seems Floros' red hair wasn't enough.

Then came a growth spurt, Floros says, and "all of a sudden he learned how to swing it and no one could hit him. He decided to stick with that, and the rest is history."

"Am I going to get back?"

The thought ran through Behrendorff's head for days as a turbulent run with injury threatened to end the dream before it really began.

He was courted by Western Australia in 2009 having been a revelation in the ACT's junior ranks.

Then came two Big Bash League titles, two one-day championships, a record-shattering 14-wicket haul in the Sheffield Shield soon followed. They had found a man with the Midas touch.

But injuries threatened to derail Behrendorff's career. Persistent stress fractures first reared their head in 2015 and threatened to make his first international stint a flash in the pan.

The left-arm quick opted to shelve his red ball ambitions this past summer. With his focus solely on white ball cricket, Behrendorff proved the Prime Minister's XI fixture still has plenty to give by tearing South Africa apart in November to earn an Australian recall.

Now his unforgettable day at Lord's serves as validation.

With a semi-final place locked up, the Australians are effectively two wins away from defending their crown.

And many believe Behrendorff may have locked down a place in the XI for the knockout stage - but his history suggests it is anything but a fait accompli.

"Every game we can win is massive, especially in a tournament like this," Behrendorff said ahead of group stage games against New Zealand and South Africa.

"They talk a lot about momentum, and that is something that is really important, to continue winning, to continue playing good cricket.

"We're still searching to play a perfect game, but we're slowly getting better and better."

When the dust settles on Behrendorff's World Cup campaign, he will emerge as a contender for Australia's Ashes squad.

Injuries have prevented him from playing a major role in long-form cricket, with stress fractures in his back prompting him to put his Sheffield Shield career on hold this year.

But the way he swung the ball against England could be a handy asset to Australia's hopes of retaining the urn.